44. Which one of the following is not a kind of chemical change?A. Iron rusting. B. Burning wood. C. Cooking an egg. D. Water boiling. 相关知识点: 试题来源: 解析 D 钢铁生锈,木头燃烧,煮鸡蛋,都是发生了化学变化;而水被煮沸,是物理变化.是否是化学变化,就看是否产生了新的物质....
25. Which one of the following is not a kind of chemical change?A. Iron rusting. B. Burning wood. C. Cooking an egg. D. Water boiling. 相关知识点: 试题来源: 解析 D D水沸腾(从液态变为气态)不是化学变化.A铁生锈,B木材燃烧和C煮鸡蛋都是化学变化.反馈 收藏 ...
Do you have to have oxygen for something to rust? Byanon255577— On Mar 18, 2012 There seem to be a lot of questions on how to prevent rust, but how would you speed up rusting without salt water, and what's all this about vinegar?
Cutting of paper into pieces is a chemical change. View Solution Rusting of iron is quicker in saline water than in ordinary water. Give reason. View Solution Doubtnut is No.1 Study App and Learning App with Instant Video Solutions for NCERT Class 6, Class 7, Class 8, Class 9, Class 10...
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第二节 练习题 The change of Taylor was that of a key man in the key slot—something that symbolized the gradual transformation of the other players. 泰勒的转变是一个把守重要关口的关键人物的转变, 他的转变象征着其他参与者也在逐渐转变。 (2) Peter made a bow. Not a servile one—he will ...
There is a growing guilt about the masses of discarded junk(丟棄的垃圾)- -rusting automobiles and refrigerators and washing machines and dehumidifiers(除濕器) that it is uneconomical to recycle. 对于大量回收利用不划算的废弃物品——锈蚀着的汽车、冰箱、洗衣机、除湿机——人们越来越感到有负罪感。 In...
Flammability - How easily something will burn or ignite, is a chemical property becauseyou can't tell just by looking at something how easily it will burn. Fire testing is done to determine how difficult or easy it will be to get a certain material to burn. ...
Oxidation and oxidisation essentially describe the same chemical reaction process, where an atom, molecule, or ion loses electrons. This process is central to various chemical and biological systems, including combustion, rusting, and cellular respiration. The primary difference between the two terms ...
we must employ determined public action. We can reduce pollution, even if we can"t eliminate it altogether. But everyone must do his part. We can have a clean world; we can do something. The choice is up to you.Which of the following statements is NOT a suggested solution to water pol...